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74HC21D Fiches technique(PDF) 5 Page - NXP Semiconductors

No de pièce 74HC21D
Description  Dual 4-input AND gate
Download  14 Pages
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Fabricant  NXP [NXP Semiconductors]
Site Internet  http://www.nxp.com
Logo NXP - NXP Semiconductors

74HC21D Fiches technique(HTML) 5 Page - NXP Semiconductors

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74HC21_5
© NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 05 — 7 May 2009
5 of 14
NXP Semiconductors
74HC21
Dual 4-input AND gate
10. Dynamic characteristics
[1]
tpd is the same as tPHL and tPLH.
[2]
tt is the same as tTHL and tTLH.
[3]
CPD is used to determine the dynamic power dissipation (PD in µW):
PD =CPD × VCC2 × fi × N+ ∑ (CL × VCC2 × fo) where:
fi = input frequency in MHz;
fo = output frequency in MHz;
CL = output load capacitance in pF;
VCC = supply voltage in V;
N = number of inputs switching;
∑ (C
L × VCC
2
× f
o) = sum of outputs.
Table 7.
Dynamic characteristics
GND = 0 V; test circuit see Figure 8.
Symbol Parameter
Conditions
25
°C
−40 °C to +85 °C −40 °C to +125 °C Unit
Min
Typ
Max
Min
Max
Min
Max
tpd
propagation
delay
nA, nB, nC or nD to nY;
see Figure 7
[1]
VCC = 2.0 V
-
33
110
-
140
-
165
ns
VCC = 4.5 V
-
12
22
-
28
-
33
ns
VCC = 6.0 V
-
10
19
-
24
-
28
ns
VCC = 5.0 V; CL = 15 pF
-
10
-
----
ns
tt
transition time
nY output; see Figure 7
[2]
VCC = 2.0 V
-
19
75
-
95
-
110
ns
VCC = 4.5 V
-
7
15
-
19
-
22
ns
VCC = 6.0 V
-
6
13
-
16
-
19
ns
CPD
power
dissipation
capacitance
VI = GND to VCC
[3]
-
15
-
----
pF


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